* Edit: By the time completely useless

+ Awesome design
+ Is very easy to hold
+4 DPI stages (speed of the pointer)
+ Cool light effect
+ 2extra buttons (easy to reach with your thumb) for forward / backward in the browser and in-game adjustable at the side
+ Mouse wheel is very quiet and easy to operate

Cons:

-after a time the mouse double clicks are clicks instead of normal (solved by CPL Mousefix quickly [...]) * Edit: After 3-4 months of CPL Mousefix no longer works. The mouse does not leave it only with double clicks, it now begins with 5-6 clicks.
Keys are a bit noisy, but still within the normal field of instrumentation
Illumination may not turn you

Personally, I find the mouse super. Plug and play worked, after the drivers are automatically found and installed. annoys me only that you can not adjust the lighting and that the mouse has started after some time with the double-click. the Mousefix the matter had then. I got used to quite quickly to the slightly larger mouse and was completely satisfied. For 20 euros this is a super thing, and I want to keep it as long as I can.